1 Introduction

The chaffinch is one of the most widespread and abundant bird in Britain and Ireland, (“RSPB,” n.d.). Monitoring of the phenotype of species is important for the species and can give indication changes in phenotypic plasticity or genetic variation, (Blackburn et al. 2013).

This data looks at the differences in mass between the male chaffinch, 1.1 and the female chaffinch, 1.2.

Male Chaffinch, By Andreas Trepte - Own work, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=15264293

Figure 1.1: Male Chaffinch, By Andreas Trepte - Own work, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=15264293

Female Chaffinch, By 4028mdk09 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=20640633

Figure 1.2: Female Chaffinch, By 4028mdk09 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=20640633

2 Methods

Importing and summarising the data from chaff.txt.

3 Results

## # A tibble: 2 x 5
##   sex      mean     n    sd    se
##   <chr>   <dbl> <int> <dbl> <dbl>
## 1 females  20.5    20  2.14 0.107
## 2 males    22.3    20  2.15 0.108
##                Df Sum Sq Mean Sq F value Pr(>F)  
## tidy_chaff$sex  1  32.22   32.22   7.007 0.0118 *
## Residuals      38 174.73    4.60                 
## ---
## Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
##   Tukey multiple comparisons of means
##     95% family-wise confidence level
## 
## Fit: aov(formula = tidy_chaff$mass ~ tidy_chaff$sex)
## 
## $`tidy_chaff$sex`
##                diff      lwr      upr     p adj
## males-females 1.795 0.422266 3.167734 0.0117504
Mean mass of male and female chaffinches

(#fig:visualising results)Mean mass of male and female chaffinches

4 Discussion

References

Blackburn, Tim M, Melanie J Monroe, Becki Lawson, Phillip Cassey, and John G Ewen. 2013. “Body Size Changes in Passerine Birds Introduced to New Zealand from the UK.” NeoBiota 17 (June): 1–18. https://doi.org/10.3897/neobiota.17.4841.